The Data-Acquisition System with Cluster-Finding Trigger at the J-PARC KOTO Experiment

In order to collect the events efficiently with a high intensity beam, we built a new trigger electronics system based on the calibrated energy information and the number of electromagnetic shower clusters in the calorimeter for the J-PARC KOTO experiment. The dead time of this system is 0.16 mu s and the loss was measured to be less than 1%. By performing the online clustering algorithm on the simulated data, the trigger efficiency for the primary mode K-L -> pi(0)nu(nu) over bar is estimated to be 99.6%.